278940428 has 12 divisors (see below), whose sum is σ = 525695520. Its totient is φ = 128741712.

The previous prime is 278940407. The next prime is 278940439. The reversal of 278940428 is 824049872.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2682068 + ... + 2682171.

It is an arithmetic number, because the mean of its divisors is an integer number (43807960).

Almost surely, 2^278940428 is an apocalyptic number.

It is an amenable number.

278940428 is a deficient number, since it is larger than the sum of its proper divisors (246755092).

278940428 is a wasteful number, since it uses less digits than its factorization.

278940428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5364256 (or 5364254 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 278940428 is about 16701.5097521152. The cubic root of 278940428 is about 653.3869974199.

The spelling of 278940428 in words is "two hundred seventy-eight million, nine hundred forty thousand, four hundred twenty-eight".